Optical connection with splicing connectors and adapter

ABSTRACT

An optical connection comprises an adapter having a housing and a splice guide. The optical connection also comprises a pair of splicing connectors each having an outer housing and a fiber guide within the outer housing. The splicing connectors also include optical fibers extending through the fiber guides. The fiber guides and optical fibers of the splicing connectors are configured to allow relative movement therebetween. The outer housing of each splicing connector is received in and latched to the housing of the adapter, and the optical fibers are abutted together within a cavity of the splice guide such that the splicing connectors are mated in the adapter.

PRIORITY APPLICATION

This is a continuation of U.S. patent application Ser. No. 13/028,799, filed on Feb. 16, 2011, which claims the benefit of priority to U.S. Provisional Application No. 61/305,733 filed Feb. 18, 2010, the content of both applications is relied upon and incorporated herein by reference.

BACKGROUND

The disclosure is directed to methods for laser processing optical fibers and fiber optic connectors. More specifically, the disclosure is directed to methods for laser processing optical fibers arranged in arrays and splicing connectors having a dense array of optical fibers.

Optical fiber is increasingly being used for a variety of applications, including but not limited to broadband voice, video, and data transmission. As bandwidth demands increase there is an unresolved need for high fiber count fiber optic connectors and methods for making the same. Moreover, the high fiber count fiber optic connectors become increasingly difficult to make as the fiber count increases since the number of fibers that must be aligned increases. In other words, the relatively small cores of the array of optical fibers must be aligned with suitable transmission loss levels for all the fibers of the array.

SUMMARY

The disclosure is also directed to splicing connectors and adapters that provide optical connection between a plurality of optical fibers. According to one embodiment, an optical connection comprises an adapter having a housing and a splice guide. The optical connection also comprises a pair of splicing connectors each having an outer housing, a fiber guide within the outer housing, and optical fibers extending beyond the fiber guide. The splicing connectors are mated together in the adapter without either splicing connector using a ferrule to support and mate the optical fibers. Additionally, the outer housing of each splicing connector are received in and latched to the housing of the adapter, and the optical fibers of each splicing connector are received and aligned by the splice guide of the adapter so that the optical fibers are spliced in a cavity of the splice guide.

According to another embodiment, an optical connection comprises an adapter having a housing and a splice guide. The optical connection also comprises a pair of splicing connectors each having an outer housing and a fiber guide within the outer housing. The splicing connectors also include optical fibers extending through the fiber guides. The fiber guides and optical fibers of the splicing connectors are configured to allow relative movement therebetween. The outer housing of each splicing connector is received in and latched to the housing of the adapter, and the optical fibers are abutted together within a cavity of the splice guide such that the splicing connectors are mated in the adapter.

An adapter for mating a pair of splicing connectors is also provided, wherein each of the splicing connectors have an outer housing and a fiber guide within the outer housing. The adapter comprises a housing and a splice guide within the housing. The splice guide has a cavity and bores disposed on first and second ends of the splice guide, with the bores extending into the cavity. The cavity comprises a reservoir with index matching material. Spaces are defined within the adapter between the splice guide and housing to accommodate a portion of the outer housing of each splicing connector, such that the adapter is configured to receive the splicing connectors with the optical fibers of the splicing connectors extending through the bores so that the optical fibers can be abutted together within the cavity.

Additional features and advantages will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the same as described herein, including the detailed description that follows, the claims, as well as the appended drawings.

It is to be understood that both the foregoing general description and the following detailed description present embodiments that are intended to provide an overview or framework for understanding the nature and character of the claims. The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments and together with the description serve to explain the principles and operation.

BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1-6 schematically depict a first method for laser processing a plurality of optical fibers using a protection element disposed between a first row and a second row of optical fibers;

FIGS. 7-11 schematically depict a second method for laser processing a plurality of optical fibers using a protection element disposed between a first row and a second row of optical fibers;

FIGS. 12-17 schematically depict a third method for laser processing a plurality of optical fibers using a protection element disposed between a first row and a second row of optical fibers;

FIGS. 17A-17G depict another protection element for laser processing a plurality of optical fibers in a plurality of rows;

FIG. 18 shows various views of a pair of fiber optic splicing connectors having an array of optical fibers mated together using an adapter;

FIG. 19 is a partial sectional view of the fiber optic splicing connector of FIG. 18;

FIG. 20 is an exploded view of the fiber optic splicing connector of FIG. 19;

FIG. 21 is a perspective view of an adapter for mating fiber optic splicing connectors having a fiber guide for aligning and splicing optical fibers therein;

FIG. 22 is a cross-sectional view of the adapter of FIG. 21;

FIGS. 22A-22C are cross-sectional views showing other adapters having lens-based transmission elements;

FIG. 23 is a perspective view of another adapter for mating fiber optic splicing connectors having a fiber guide for aligning and splicing optical fibers therein;

FIG. 24 is a cross-sectional view of the splicing connector of FIG. 23;

FIG. 25 is a partial sectional view of the splicing connector of FIG. 23 showing details of the gel reservoir entry;

FIG. 26 is a schematic cross-sectional view of the splicing connector of FIG. 23 showing the profile of the gel reservoir; and

FIGS. 27 and 28 respectively depict an end view and a plan view of the splicing connector of FIG. 20;

FIG. 29 shows an optional geometry for the fiber guide bores of the adapter.

DETAILED DESCRIPTION

Reference will now be made in detail to the preferred embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Whenever possible, like reference numbers will be used to refer to like components or parts.

The embodiments and methods described herein are suitable for preparing and/or making optical connections employing a plurality of optical fibers. The concepts of the disclosure advantageously allow the simple, quick, and economical connection between relatively large numbers of optical fibers. Reference will now be made in detail to the preferred embodiments, examples of which are illustrated in the accompanying drawings. Whenever possible, like reference numbers will be used to refer to like components or parts.

FIGS. 1-6 schematically depict a first method for laser processing the ends of a plurality of optical fibers 10 of structure 30 using a protection element 40. Laser processing of optical fibers provides a quick and efficient method for producing a high-quality end face on the optical fiber for termination or the like. Structure 30 may be a fiber optic cable, a ribbon, or other suitable structure having an array of optical fibers known in the art or later developed. By way of example, structure 30 may have multiple ribbons stacked within a cable jacket of the fiber optic cable, thereby defining an array of optical fibers. Other arrangements for the fibers of structure 30 can include one or more groups of loose fibers, loose fibers with ribbonized ends, etc. Although structure 30 shows the array of optical fibers located in linear array other arrangements are possible. Moreover, as used herein “row” means a grouping of optical fibers and is not limited to a linear arrangement. Other structures 30 may have the array of optical fibers included within one or more ribbon matrix materials. The array of optical fibers may be arranged in multiple rows of optical fibers as shown, but the array can have other fiber counts, arrangements, and the like. Additionally, any suitable fiber size, type, and/or spacing arrangement may be used with the concepts disclosed herein for preparing and creating a fiber structure processed using a laser for one or more steps.

By way of explanation, an end of a cable or assembly can be prepared for securing the optical fibers in a suitable structure by first removing a portion of the cable jacket and then grouping or organizing the fibers as desired for insertion into the structure (i.e., fiber organizer). The structure secures the optical fibers at a common location for inhibiting relative movement among the fibers in the array. Moreover, the structure may be used for holding the same in fixturing, thereby providing a convenient and common location for reference. Thereafter, the optical fibers may be processed as desired for connectorization. For instance, the laser may be used for cleaning, removing and/or ablating one or more coatings on the optical fiber, but other types of mechanical processing methods are possible for removing the coating from the fiber. Further, the laser may be used for cleaving and/or shaping the end of the optical fiber as desired, but may also include a mechanical cleaving and/or polish in addition to the laser processing. Thereafter, the laser processed fibers may be used with suitable connectors or assemblies that may or may not use a ferrule for holding the fibers.

More specifically, FIGS. 1-6 depict a first method for laser processing a plurality of optical fibers 10 using a protection element 40. Protection element 40 is used for protecting optical fibers in the array that are not intended for laser processing since they are located at a further distance from the laser than the optical fibers intended for processing. By way of example, structure 30 has optical fibers disposed in a first row 16 a first distance and a second row 18 at a second distance so that the laser could not be focused for both distances. As shown, the first row 16 and second row 18 of optical fibers 10 are schematically shown disposed within a generic structure 30. The protection element 40 can reflect, absorb and/or disperse the laser energy after it passes the optical fibers being processed depending on the type of material used for the same. For instance, if the protection element 40 is a material that has a smooth surface such as a machined aluminum, stainless steel, etc. it will have a high-degree of reflection. On the other hand, if the protection element 40 is formed from a mica, carbon, ceramic plate or other similar porous material it will have a high-degree of absorption. Still further, the degree of dispersion caused by protection element 40 can depend on the surface finish. In other words, the rougher the surface the greater the dispersion. Examples of surface finishes on protection element 40 that can create dispersion are grooves, knurling, etc.

Although protection element 40 is shown having a rectangular shape in the drawings other shapes are possible. By way of example, the protection element 40 may be a square or round disc making it easier to rotate and/or translate the same as part of the laser processing of optical fibers. Simply stated, the protective element 40 may move by being rotated and/or translated to provide a fresh surface thereby providing heat dissipation, a clean surface, and/or allow wiping of glass residue from the protection element 40. Consequently, the life of the protection element is extended by rotating and/or translating the same. Other more sophisticated protection elements are also possible as discussed herein. For instance, the protection element can include a hinged portion having a slot for receiving the current working array of fibers and protecting the array of fibers above and/or below the working array of fibers, thereby making it easier for processing fiber arrays having a relatively small pitch or spacing between fibers.

In this first explanatory method, protection element 40 has a smooth surface that has a relatively high degree of reflection of the laser energy that impinges on the same. Protection element 40 allows the laser energy to reach the optical fibers being processed, but inhibits the laser energy from damaging the optical fibers not being processed, other portions of structure 30, or from creating a safety issue, but the protection element may also absorb and/or disperse a portion of the energy depending on the material used. This first method also uses an optional laser absorption element 42 to contain the reflected laser energy. As shown by FIG. 1, protection element 40 is positioned near the ends of the optical fibers 10 and a laser absorption element 42 is disposed above the first row 16 of optical fibers 10 to inhibit the travel of any reflected laser energy from protection element 40.

FIGS. 2-6 depict the other steps for processing optical fibers using the first method. FIG. 2 shows protection element 40 being positioned adjacent to the plurality of the optical fibers for presenting a first row (i.e., first group) of optical fibers for laser processing and shielding a second row (i.e., second group) of optical fibers from the laser processing. As depicted in this configuration, protection element 40 is inserted between the first row 16 and the second row 18 of optical fibers 10 as represented by the arrow so that the first row of optical fibers 16 may be laser processed while the second row 18 of optical fibers is shielded from the laser. Thereafter, the protection element 40 may optionally translate for pushing the second row 18 of optical fibers away from the first row 16 of optical fibers as represented by the arrow in FIG. 3. Pushing the second row 18 of optical fibers away from the first row 16 creates more space between the first row 16 of optical fibers and protection element 40. As shown in FIG. 4, the created space allows the laser energy to diverge before impacting protection element 40 and being reflected. Allowing a laser beam 48 to diverge after processing the optical fibers can inhibit excess removal of the coating from the optical fiber by reducing the energy density (i.e., the energy is spread over a larger area compared with the beam waist). In other words, the increased space allows the laser beam 48 to diverge after contacting the optical fibers and before being reflected.

Other variations for using the protection element 40 and/or laser absorbing element 42 are possible. As a variation on FIG. 4, the laser beam 48 may initially pass thru an opening on top plate 42 before impacting the fibers so that the top plate 42 also acts as a shield for the incoming laser beam 48. Additionally, the methods and configurations for laser processing disclosed herein may use lenses, mirrors, beam splitters or the like for directing the laser beam to the optical fibers. Although the laser beam of FIG. 4 is shown approaching from a single-side, other embodiments that directed the laser beam one or more sides such as from both sides are contemplated with the concepts disclosed herein.

FIG. 5 depicts a portion of the laser beam 48 being reflected off protection element 40 and a reflected beam 48′ impacting absorption element 42. During laser processing, the laser beam 48 may be swept across the first row 16 in any suitable manner to process the optical fibers 10. FIG. 6 depicts structure 30 after laser processing the first row 16 of optical fibers 10. Thereafter, a similar process may be repeated on the second row 18 of optical fibers 10 or repeated for a further row or grouping of fibers. Additionally, protection element 40 may be rotated and/or translated as represented by the arrow in FIG. 6 for presenting a fresh surface as described above.

FIGS. 7-11 schematically depict a second method for laser processing a plurality of optical fibers 10 using protection element 40. The second method is similar to the first method, except that the protection element 40 is formed from a material having a high degree of absorption (i.e., ideally no reflection). FIG. 8 shows protection element 40 being inserted between the first row 16 and the second row 18 of optical fibers 10 as represented by the arrow. Thereafter, the protection element 40 may optionally translate for pushing the second row 18 of optical fibers away from the first row 16 of optical fibers as represented by the arrow in FIG. 9. Pushing the second row 18 of optical fibers away from the first row 16 creates more space between the first row 16 of optical fibers and protection element 40. Additionally, an optional absorption element (not shown) may be placed above the first row 16 of optical fibers for safety. As shown in FIG. 10, the created space allows the laser energy to diverge before impacting protection element 40. Allowing a laser beam 48 to diverge from the beam waist after contacting and processing the optical fibers reduces the energy density that impacts protection element 40 and generally speaking prolongs its life. During laser processing, the laser beam 48 may be swept across the first row 16 in any suitable manner to process the optical fibers 10. FIG. 11 shows the first row 16 of optical fibers 10 after laser processing and a similar process may be repeated on the second row 18 of optical fibers 10 such as by flipping the structure 30 or using a second laser from the other side.

FIGS. 12-17 schematically depict a third method for laser processing a plurality of optical fibers 10 using protection element 40. The third method is similar to the first and second methods, except that the protection element 40 is formed from a material having a high degree of dispersion. FIG. 13 shows protection element 40 being inserted between the first row 16 and the second row 18 of optical fibers 10 as represented by the arrow. Thereafter, the protection element 40 may optionally translate for pushing the second row 18 of optical fibers away from the first row 16 of optical fibers as represented by the arrow in FIG. 14. As stated before, pushing the second row 18 of optical fibers away from the first row 16 creates more space between the first row 16 of optical fibers and protection element 40, thereby allowing the laser beam to diverge before impacting protection element 40 as shown in FIG. 15. Additionally, an optional absorption element (not shown) may be placed above the first row 16 of optical fibers for safety. FIG. 16 depicts the laser beam 48 diverging after being reflected from protection element 40. As with the other methods, the laser beam 48 may be swept across the first row 16 in any suitable manner to process the optical fibers 10. FIG. 17 shows the first row 16 of optical fibers 10 after laser processing and a similar process may be repeated on the second row 18 of optical fibers 10 such as by flipping the structure 30 or using a second laser from the other side.

Although the methods disclosed show processing an array of optical fibers having two rows as shown, structures having more rows and/or other array arrangements of optical fibers can be processed using the concepts disclosed herein. For instance, processing more than two rows may involve bending the upper rows out of the way such as by using a second protective element so that particular individual rows can be exposed and processed with the laser beam. Consequently, much larger arrays of optical fibers may be laser processed using the concepts disclosed herein.

FIGS. 17A-17G depict another protection element 140 configured as a fiber separation device having a hinge 146 for laser processing an array of optical fibers. Protection element 140 aids when processing optical fibers 10 of structure 30 having a relatively small pitch among the groups of fibers (i.e., relatively tight spacing among the fibers) and especially advantageous when there are three or more rows of fibers. FIG. 17A shows the fiber separation device having a lower portion (or first portion) 142 and a upper portion (or second portion) 144 connected by hinge 146, thereby allowing relative movement between the lower portion 142 and upper portion 144. FIG. 17B shows the protection element 140 positioned about the optical fibers of structure 30. Moreover, the lower portion 142 and the upper portion 144 form a space 148 between hinge 146 so that the one or more fibers being processed by the laser can pass through the space 148 as best shown in FIG. 17C. Protection element 140 may also optionally include one or more recesses or trays 143 for positioning optical fibers therein.

In other words, the protective element 140 is positioned so that the hinge 146 is pointing towards the ends of the optical fibers of structure 30 as shown by FIG. 17A. The fibers of structure 30 intended for processing are positioned so that they enter the space 148 of protection element 140 and are positioned between lower portion 142 and upper portion 144 as shown in FIG. 17B. The other rows of fibers not intended for laser processing are located either below the lower portion 142 or above the upper portion 144 so that they are positioned out of the way. Thereafter, the lower portion 142 and/or upper portion 144 can rotate (i.e., be spread apart) for providing access to the row of optical fibers intended for processing such as shown by FIG. 17C. FIG. 17D shows the laser beam 48 being used to process a row of optical fibers and how the other fibers are shielded from the laser beam 48 using protective element 140. As one row of fibers is finished with laser processing, the structure 30 is moved outward to remove the processed fibers and downward to align the next row of fibers with the space 148 as the protection element is positioned to laser process the next row of fibers as shown in FIG. 17E. FIG. 17F shows a rear perspective view showing the laser processed fibers protected by the upper portion 144 and the fiber that still require processing protected by the lower portion 142. It is also possible to index the laser off a portion of the structure 30 and/or other locations for maintaining similar lengths of fibers in the array after laser processing. Protection element 140 may also be used with a device/element 160 for energy capture as depicted in FIG. 17G.

The protection elements disclosed herein can have other features that aid in the laser processing and/or inhibit damage to the optical fibers. For instance, the outer surface of the upper portion can have a relatively soft insert in recess 143 for cushioning the processed optical fibers, thereby inhibiting damage to the same. Likewise, the protection element can have an active cooling element such as running water through passages in the same for dissipating heat from the protective structure. As discussed above, the protection element can have a surface that reflects, absorbs and/or disperses a portion of the energy depending on the material and/or surface finishing selected. Of course other suitable structures are possible using the concepts disclosed herein. For instance, a protection element configured as a fiber separation device can be formed from two portions that operate in a similar manner to protection element 140 but are attached in another suitable manner besides a hinge such as a rib and slot for alignment and opening. Although protection element 140 is shown as having a hinge with a movable portion it is possible to fix the first and second portions at a fixed angle with a space therebetween and use the device in a similar manner by inserting the row of fibers for processing through the space of the device. After laser processing one or more structures having an array of optical fibers, the structure(s) may be used with a suitable fiber optic connector or other termination devices, thereby permitting a plurality of optical connections. This is advantageous since the craft can quickly and easily make a large number of optical connections with a relatively small footprint (i.e., high connection density). For instance, a fiber optic connector can have 24-fibers or more such as 36-fibers, 48-fibers or 72-fibers. Examples of fiber optic connectors and/or termination devices for use with these structures is disclosed herein, but other types of fiber optic connectors and/or termination devices may also employ optical fibers processed using the methods described herein.

FIG. 18 depicts a side view, a perspective view, and top view of two fiber optic splicing connectors 50 (hereinafter splicing connector) having an array of optical fibers 52 mated together using an adapter 90. The optical fibers 52 of splicing connectors 50 may be processed using a laser according to one of the methods disclosed herein, but other methods of process the same are possible.

FIG. 19 is a partial sectional view along with an enlarged detail portion of splicing connector 50 showing a relatively long length of optical fibers 52 protruding from a fiber guide 54 within an outer housing 56. Optical fibers 52 have a relatively long length that extends beyond fiber guide 54 since they are aligned and spliced to complimentary mating optical fibers within adapter 90 without the use of a ferrule. In other words, the splicing connectors disclosed do not use a ferrule to support and mate optical fibers like conventional fiber optic connectors; but, rather are spliced with complimentary optical fibers in the adapter as discussed below. Simply stated, fiber guide 54 is used for supporting and aligning optical fibers 52 when mating splicing connector 50 within a splice guide of the adapter 90. Moreover, fiber guide 54 is biased to a forward position and can move relative to optical fibers 52 (i.e., translate backwards) for exposing a longer length of the same to extend into the splice guide of adapter 90.

FIG. 20 is an exploded view of splicing connector 50 depicting the component and assembly of the same. As shown, splicing connector 50 includes fiber guide 54, outer housing 56, a spring push 58, a spring 60, a crimp body 62, a crimp band 64, and a boot 68. When assembled, fiber guide 54, spring push 58 and spring 60 are disposed between the outer housing 56 and crimp body 62. In other words, crimp body 62 includes a pair of latching fingers (not numbered) that cooperate with latching windows (not numbered) at the rear of outer housing for securing the components together. Consequently, fiber guide 54 is disposed within outer housing 56 as shown in FIG. 19 and is biased to the forward position by spring 60. Outer housing 56 can have any suitable configuration and is sized, shaped, keyed, latching features, etc. for mating with adapter 90. Crimp body 62 includes a passageway therethrough so that the optical fibers 52 may be routed to therethrough to the front portion of splicing connector 50. Crimp body 62 also includes a crimp portion at the rear for securing strength members of a fiber optic cable or the like using crimp band 64, thereby providing strain relief. Thereafter, boot 68 may placed over the rear portion of the crimp body 62 for completing the assembly. Other constructions for splicing connector are possible and splicing connectors may be mated with any suitable adapter for making splicing connections among optical fibers.

FIGS. 21 and 22 respectively depict a perspective view and cross-sectional view of one explanatory adapter 100 for receiving and mating splicing connectors similar to splicing connectors 50. Adapter 100 includes a housing 102, a splice guide 110, and a cap 130. Splice guide 110 is used for aligning and splicing optical fibers from the splicing connectors therein. Additionally, splice guide 110 includes a cavity 114. Cavity 114 can include one or more transmission elements for aiding the transmission of optical signals between the fibers of the splicing connectors received in opposite ends of adapter 100. For instance, the cavity can use a transmission element such as an index-matching material or beam expanding lenses for aiding the optical signal transmission therethrough. As an example, the cavity 114 may be a reservoir for an index matching material located between the fiber ends. Cavity 114 has an opening 118 for filling the cavity 114 and securing reservoir cap 130. Cavity 114 may be filled with a suitable index-matching material such as a gel for improving the optical connection between spliced optical fibers as known in the art. Thereafter, reservoir cap 130 may be secured splice guide 110 to inhibit the index-matching material from escaping. Additionally, housing 102 may have any suitable geometry for mounting, latching the splice connector, keying the splice connector, etc.

Other structures and methods are also possible for aligning the fibers for transmitting optical signals between the arrays of fibers inserted into the adapter. For instance, the adapter could include beam expanding lenses between the arrays of fibers. By way of example, the cap could be modified to include a plurality of beam expanding lens for transmitting signals between the optical fibers inserted from each end. FIGS. 22 a-22 c depict alternative adapters 100′ similar to adapter 100, but use a lens element 130′ as the transmission element within the cavity 114 instead of an index-matching material. In particular, FIGS. 22 a-22 c shows different lens elements 130′ that respectively use a plurality of convex lenses 132, a plurality of concave lenses 134, and a plurality of graded refractive index (GRIN) lenses 136 for beam expansion. As with cap 130, the lens elements 130′ are removable for allowing cleaning and/or replacement of the same. Embodiments using the GRIN lenses are advantageous since they may be used with an index matching material which allows the fibers to abut the GRIN lenses, whereas the concave or concave lenses are preferably dry (i.e., no index matching material) and the fiber are located at or near the the focal point of the lens. Also the GRIN lenses may have a well for receiving the index-matching material if desired.

In these embodiments, adapters 100 and 100′ include a splice guide 110 configured as an insert that fits into housing 102. Configuring splice guide 110 as an insert of adapter 100 or 100′ is advantageous for manufacturing since the high-precision structure can be manufactured into the insert and not the entire assembly (i.e., the housing). Splice guide 110 includes a rib 116 that fits into a groove (not numbered) of housing 102 as shown for seating the same with respect to housing 102. Housing 102 also includes an opening 103 for receiving reservoir cap 130 or lens element 130′ therethrough. To assemble the adapters, the splice guide 110 is inserted into housing 102 so that rib 116 is seated into the groove of housing 102. Thereafter, the reservoir cap 130 or lens element 130′ can be inserted through the opening 103 of housing 102 so that is attaches to the opening 118 of cavity 114 of the splice guide 110. For the embodiments using an index-matching material, cavity 114 of splice guide 110 may be filled with an index-matching material at any suitable time such as before inserting the splice guide 110 into housing 102, before attaching the reservoir cap 130, or the reservoir cap 130 may be removed after assembly to fill cavity 114.

As best shown in FIG. 22, splice guide 110 has a plurality of bores (not numbered) that extend from a first end and a plurality of bores (not numbered) that extend from a second end. The plurality of bores disposed on the first and second ends of the splice guide 110 extend into a cavity 114. The bores include a fiber lead-in portion 112 for guiding each respective optical fiber to a precision opening (not numbered) adjacent to cavity 114. In other words, the lead-in portion 112 receives the respective optical fiber from the splicing connector and provides coarse alignment and guides the optical fiber to the precision opening. Consequently, mating optical fibers from each mating splicing connector inserted into adapter 100 are precisely aligned and abutted within the cavity 114 that has the index-matching material therein. In the case of adapters 100′, the mating optical fibers from each mating splicing connector are inserted into adapter 100′ are precisely aligned and adjacent and/or abutted to the respective lenses of lens cap 130′. When the splice connector is inserted into adapter 100 the optical fibers are received in respective lead-in portions 112 of the splice guide, then as the fiber guide of the splice connector abuts splice guide of the adapter 100, the fiber guide slides rearward relative to the optical fibers so they can be fully inserted into the splice guide 110. Moreover, the optical fibers may have a slight overlength for mating, thereby keeping the optical fibers abutted in physical contact with a small spring force and/or slight bend in the optical fibers to ensure good optical connectivity.

FIGS. 23 and 24 respectively are a perspective and cross-sectional view of another adapter 200 for mating splicing connectors, thereby making high-density optical connections. Adapter 200 is similar to adapter 100 in operation and other respects, but it has a fiber guides 210 that are integral with the housing, thereby eliminating the number of components. However, adapter 200 may be more difficult to manufacture since the high-precision portions are integrated with the housing (not numbered). Adapter 200 includes fiber guides 210 having a plurality of bores that respectively extend from a first end and a second end to a cavity 214. Cavity 214 is configured for receiving an index-matching material therein for improving the optical connection between abutting optical fibers. Additionally, cavity 214 has an opening 218 for filling the same with an index-matching material and which may be closed or sealed with a cap or other suitable structure (not shown). As best shown in FIGS. 24 and 25, the side of fiber guides 210 adjacent to cavity 214 includes a plurality of tunnels 213 for aiding manufacturing. FIG. 26 is a schematic cross-sectional view of adapter 200 showing the profile of the cavity 214. FIGS. 27 and 28 respectively depict an end view and a plan view of adapter 200 showing details like keying features 219 and the like.

FIG. 29 shows an optional geometry for the fiber guide of an adapter. Specifically, FIG. 29 shows the detail of a bore 240 of the fiber guide that includes a a plurality of ribs 242. Ribs 242 act as a centering structure allowing alignment of the optical fibers within the bore by centering the optical fiber therein. Other configurations of ribs may use other shapes, positions, and/or other numbers for providing centering for the optical fibers.

Although the disclosure has been illustrated and described herein with reference to preferred embodiments and specific examples thereof, it will be readily apparent to those of ordinary skill in the art that other embodiments and examples can perform similar functions and/or achieve like results. All such equivalent embodiments and examples are within the spirit and scope of the disclosure and are intended to be covered by the appended claims. It will also be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit and scope of the same. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. 

We claim:
 1. An optical connection, comprising: an adapter having a housing and a splice guide within the housing; and a pair of splicing connectors each having an outer housing, a fiber guide within the outer housing, and optical fibers extending beyond the fiber guide; wherein the splicing connectors are mated together in the adapter without either splicing connector using a ferrule to support and mate the optical fibers, the outer housing of each splicing connector being received in and latched to the housing of the adapter, and the optical fibers of each splicing connector being received and aligned by the splice guide of the adapter so that the optical fibers are spliced in a cavity of the splice guide.
 2. The optical connection of claim 1, wherein spaces are defined within the adapter between the splice guide and housing to accommodate a portion of the outer housing of each splicing connector.
 3. The optical connection of claim 2, wherein the splice guide includes portions extending above and below the cavity such that the spaces are located within the adapter on opposite sides of the vertical portions.
 4. The optical connection of claim 2, wherein the splice guide is integral with the housing.
 5. The optical connection of claim 1, wherein the fiber guide and optical fibers of each splicing connector are configured to allow relative movement therebetween.
 6. The optical connection of claim 1, wherein the optical fibers have an overlength for mating such that the optical fibers are abutted in physical contact with a bend kept in the optical fibers.
 7. The optical connection of claim 1, wherein the splice guide of the adapter includes bores disposed on first and second ends of the splice guide, the bores extending into the cavity of the splice guide.
 8. The optical connection of claim 1, wherein the cavity of the splice guide comprises a reservoir with index matching material.
 9. An optical connection, comprising: an adapter having a housing and a splice guide within the housing; and a pair of splicing connectors each having an outer housing and a fiber guide within the outer housing, the splicing connectors also including optical fibers extending through the fiber guides; wherein: the fiber guides and optical fibers of the splicing connectors are configured to allow relative movement therebetween; the outer housing of each splicing connector is received in and latched to the housing of the adapter; and the optical fibers are abutted together within a cavity of the splice guide such that the splicing connectors are mated in the adapter.
 10. The optical connection of claim 9, wherein spaces are defined within the adapter between the splice guide and housing to accommodate a portion of the outer housing of each splicing connector.
 11. The optical connection of claim 10, wherein the splice guide includes portions extending above and below the cavity such that the spaces are located within the adapter on opposite sides of the vertical portions.
 12. The optical connection of claim 9, wherein the splice guide is integral with the housing.
 13. The optical connection of claim 9, wherein the optical fibers have an overlength for mating such that the optical fibers are abutted in physical contact with a bend kept in the optical fibers.
 14. The optical connection of claim 9, wherein the splice guide of the adapter includes bores disposed on first and second ends of the splice guide, the bores extending into the cavity of the splice guide.
 15. The optical connection of claim 1, wherein the cavity of the splice guide comprises a reservoir with index matching material.
 16. A system for an optical connection, comprising: an adapter having a housing and a splice guide within the housing; and a pair of splicing connectors each having an outer housing and a fiber guide within the outer housing, the fiber guide including a cavity comprising a reservoir with index matching material, the splicing connectors also including optical fibers extending through the fiber guides; wherein: the fiber guides and optical fibers of the splicing connectors are configured to allow relative movement therebetween; the splicing connectors do not include a ferrule to support the optical fibers; the outer housing of each splicing connector configured to be received in and latched to the housing of the adapter; and spaces are defined within the adapter between the splice guide and housing to accommodate a portion of the outer housing of each splicing connector, such that the adapter is configured to receive the splicing connectors with the optical fibers extending into the cavity so that the optical fibers can be abutted together within the cavity.
 17. The system of claim 16, wherein the splice guide of the adapter includes bores disposed on first and second ends of the splice guide, the bores extending into the cavity of the splice guide so that the optical fibers can be aligned and abutted within the cavity.
 18. The system of claim 16, wherein the splice guide includes portions extending above and below the cavity such that the spaces are located within the adapter on opposite sides of the vertical portions.
 19. The system of claim 16, wherein the splice guide is integral with the housing.
 20. An adapter for mating a pair of splicing connectors that each have an outer housing and a fiber guide within the outer housing, the adapter comprising: a housing; and a splice guide within the housing, the splice guide having a cavity and bores disposed on first and second ends of the splice guide, the bores extending into the cavity; wherein: the cavity comprises a reservoir with index matching material; and spaces are defined within the adapter between the splice guide and housing to accommodate a portion of the outer housing of each splicing connector, such that the adapter is configured to receive the splicing connectors with optical fibers of the splicing connectors extending through the bores so that the optical fibers can be abutted together within the cavity.
 21. The adapter of claim 20, wherein the splice guide includes portions extending above and below the cavity such that the spaces are located within the adapter on opposite sides of the vertical portions.
 22. The adapter of claim 20, wherein the splice guide is integral with the housing. 